Telefonaktiebolaget Lm Ericsson (publ)

Jichang Liao

Youping Su

Vimar Björk

Ang Feng

Yanhui Zhao

Erik Hammarberg

Qingzhi Feng

A radio chain arrangement comprising at least two levels of radio chain entities. Each of the levels of radio chain entities is associated with a respective frequency range encompassing at least one radio frequency band each. At least two radio chain entities of a lower level of radio chains are comprised in a radio chain entity of a next higher level. Each radio chain entity of the at least two levels of radio chain entities comprises a respective radio transceiver arrangement that is connected to at least a respective one of a number of antenna multiplexers. For all radio chain entities except a lowest level, the respective radio transceiver arrangement is connected to the antenna multiplexers via a splitter arrangement. An active antenna system comprising such radio chain arrangements and a method for its operation is also disclosed.

Wide band active antenna system radio

A method of calibrating an antenna array in a wireless network node is disclosed, the wireless network node including a plurality of antenna branches, each of the plurality of antenna branches including a respective antenna element. The method includes repeating operations of transmitting a slice of a fountain coded sequence through the plurality of antenna branches to the respective antenna elements, and for each antenna branch of the plurality of antenna branches, selecting the transmitted slice as a feedback signal through a return path and determining a signal quality of the feedback signal, until the signal quality of the feedback signal for each antenna branch is greater than a threshold level. The method further includes performing antenna calibration based on the feedback signal for each antenna branch. Related devices, computer programs and computer program products are disclosed.

Antenna calibration using fountain coded sequence

A radio unit for unsynchronized Time Division Duplex (TDD) multi-band operation in a wireless communication system. The radio unit comprises a first resonator arrangement comprising one or more resonators tuned for operating at a first frequency band. A first terminal of the first resonator arrangement is coupled to an antenna element. The radio unit further comprises a second resonator arrangement comprising one or more resonators tuned for operating at a second frequency band. A first terminal of the second resonator arrangement is coupled to the antenna element. The radio unit further comprises a tunable resonator arrangement comprising at least four tunable resonators. The at least four tunable resonators in the tunable resonator arrangement are tuned according to different operating modes.

Growing community of inventors

Sollentuna, Sweden

Jichang Liao